Path: utzoo!attcan!uunet!seismo!sundc!pitstop!sun!wind!naughton
From: naughton%wind@Sun.COM (Patrick Naughton)
Newsgroups: comp.sys.ibm.pc
Subject: Re: TC2.0 bugfree ?
Summary: bug in bug report.
Message-ID: <86271@sun.uucp>
Date: 20 Jan 89 21:32:02 GMT
References: <3785@druwy.ATT.COM>
Sender: news@sun.uucp
Reply-To: naughton@sun.com (Patrick Naughton)
Organization: Sun Microsystems, Mountain View
Lines: 33

In article <3785@druwy.ATT.COM> rhm@druwy.UUCP (MasseyR) writes:
>No bugs in TC2.0 ?
>
>This small model C program :
>sub( cp )
>unsigned char 	*cp;
>{
>	int 	i;
>
>	i = (*cp++ << 8) + *cp++;

This is bogus code anyways...

Remember that '+' is commutative.
you are saying that:
	i = (*cp++ << 8) + *cp++;
is the same as:
	i = *cp++ + (*cp++ << 8);
which it is obviously not.

You should use:
	i = (*cp << 8) + *(cp+1); cp += 2;

...but the code you sent out did look like it showed up a compiler bug,
none the less.

-Patrick


    ______________________________________________________________________
    Patrick J. Naughton				    ARPA: naughton@Sun.COM
    Window Systems Group			    UUCP: ...!sun!naughton
    Sun Microsystems, Inc.			    AT&T: (415) 336 - 1080